A) \[FeC{{l}_{3}}\] is used in detection of phenol
B) Fehling solution is used in detection of glucose
C) Tollen's reagent is used in detection of unsaturation
D) \[NaHS{{O}_{3}}\] is used in detection of carbonyl compound
Correct Answer: C
Solution :
Tollen's reagent is ammoniacal silver nitrate solution and it is used for detection of aldehyde group not for unsaturation. Aldehydes reduces Tollen's reagent to give adds and silver powder is obtained which forms silver coloured mirror in the test tube. \[R-CHO\,+{{[Ag{{(N{{H}_{3}})}_{2}}]}^{+}}\to \,\,RCO{{O}^{-}}+\underset{powder}{\mathop{Ag}}\,\]
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